2008 MacBook freezing only when battery is attached

My 2008 black MacBook freezes when the battery is attached. If it is removed and ran on only AC power that machine works just fine. I have two of the exact same MacBooks (black, 2008) and have tried swapping batteries. According to system profiler they both are just fine. It seems to happen even if the machine isnt moved. The freezing is a hard freeze, that is, i cannot move my mouse or type and everything is just still. I have heard that some kind of ribbon wire could be the problem and people have said that putting a piece of paper on/around it can temporarily solve the problem. I am unsure of how to do this and am not even totally sure if this is whats wrong. Does anyone know of anywhere i can find good instructions for this? Will apple fix the problem? for free?

I have tried reseting the PRAM and SMC, both do not work. I have also erased the hard drive and reinstalled a fresh copy of snow leopard (i lost installation disc 2 of my original OS X cds, so apple told me to buy a new copy...over the phone that is). At any rate, the installation worked just fine and nothing has been installed or modified since. I really would like to fix this ASAP because I intend to give it to my girlfriend for our anniversary in a few days.

3. Power your MB up & immediately take it into Safe Mode (after the startup chime, hold down one of the Shift keys until the login screens shows up. Let go of Shift. Log in. Let it finish booting. At the Desktop, do a few ordinary things on your MB (not all programs will function in SafeMode though).

4. Report back here whether your MB freezes on battery-only power while it's in Safe Mode.

Second, download & install the iStat Menu utility.

After installing it, make notes of the MB's internal temperatures, particularly the 3 battery sensor temperatures when A) It's powered by only the adapter and then after a cooling down period, B) It's powered by only the battery. The Battery Temperature reading in iStat should show right around 85-90 degrees.

Here's a screenshot of my own iStat, with the mouse arrow pointing at my MB's current battery temperature:

3. Did the frequency of the battery-only freezup problem develp slowly over time, freezing only every once in a while until now your MB freezes quite often, or did the problem just show up overnite -- yesterday, fine; today, freezing with only the battery in it?

4. Did you do anything major as far as changes to your MB are concerned, or did anything happen to it? (dropped, keyboard spill, etc)

This is an important one:

5. If you were to start your Macbook up in the morning on battery only after it being shut down all night, and the MB is being used normally, how long in minutes does it take, on average, for the first freezeup to occur?

6. When it is powered by battery only, and absolutely nothing has been done on it for quite a while after it's been turned on, & it's just sitting there with the screen open & the screensaver is running or the display is in sleep, does it freeze up?

7. Compare the temperatures of the bottom of your MB between 15-20 minutes of Power Adapter only use, and 15-20 minutes of Battery only use, with a cooling down period in between the two tests. Is there a huge difference in the two temperatures, or not much difference?

We'll get it.......

But I & other helpers who read your post just need more info from you before anyone can go any further with this.

My 2008 black macbook has been doing the exact same thing except the battery actually says it needs to be serviced. Are freezing or shutting off suddenly typical signs that a battery needs replacement? I, too, wiped my hard disk and reinstalled Snow Leopard (after bad luck with Lion) but it is still happening occasionally. I can also maybe try answering all the above questions, but for now can anyone tell me if this sounds like a possible battery issue?

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